1° I am trying to install other languages on other domain than the main domain and get this message even though my license says unlimited installations
-->How can I solve this?
2° In the Easysocial forum there is an answer to this but I cannot see it because it is restricted.
-->Why do you restrict the visibility of a forum as many topics or solutions regarding one extension can be found on another forum?
And it is also strange that once your license expires you cannot see the forums anymore, I understand that you cannot post if your license is expired but no access at all to documentation/forum is a very uncommon commercial behavior.